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ICSE Class 9 Current Electricity — practice questions — page 2

Explore 45 free Current Electricity questions in ICSE Class 9 Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Current Electricity questions and exercises with answers

Showing questions 31–45 of 45.

Which quantity is which?Read the answer and worked solution →Assertion and reasonRead the answer and worked solution →Charge carriersRead the answer and worked solution →Two are true, one is notRead the answer and worked solution →Three of these are wrong. Find the one that holds.Read the answer and worked solution →Tap every statement true of drift velocityRead the answer and worked solution →Complete the temperature coefficient definitionRead the answer and worked solution →Flip and pair: symbol with quantityRead the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →Reading the definitions backRead the answer and worked solution →Property of the object or of the substance?Read the answer and worked solution →Order the chain: field to currentRead the answer and worked solution →True or false: circuits and sourcesRead the answer and worked solution →Assertion and reason: circuitsRead the answer and worked solution →Tap every quantity the chapter treats as material-dependentRead the answer and worked solution →

Worked practice questions

Which quantity is which?

Read exercise and reference answers
Items
  1. Item
    Net charge per unit time through an area
    Category
    Current
  2. Item
    Measured in amperes
    Category
    Current
  3. Item
    Charge per second per unit area
    Category
    Current density
  4. Item
    Written j = nqv_d
    Category
    Current density
  5. Item
    The slow average speed of the carriers
    Category
    Drift velocity
  6. Item
    Proportional to the field, not to acceleration
    Category
    Drift velocity
Categories
  1. Item
    Current
  2. Item
    Current density
  3. Item
    Drift velocity
Keeping current, current density and drift velocity apart. Source: syllabus Physics Part I, Ch 3 Current Electricity.

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Assertion and reason

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Questions
  1. Reason
    Electrons collide with ions at regular intervals, which caps their speed.
    Verdict
    Both are true; the reason explains the assertion.
    Assertion
    Drift velocity is proportional to the applied field, not to acceleration.
  2. Reason
    Many substances obey it, but several well known ones do not.
    Verdict
    Both are true; the reason explains the assertion.
    Assertion
    Ohm's law is not a fundamental law of nature.
  3. Reason
    emf is the work done per unit charge by the source.
    Verdict
    The assertion is false and the reason is true.
    Assertion
    emf is a kind of force.
  4. Reason
    Some potential is dropped across the source's internal resistance.
    Verdict
    Both are true; the reason explains the assertion.
    Assertion
    Terminal voltage falls when current is drawn.
The reason must genuinely explain the assertion. Source: syllabus Physics Part I, Ch 3 Current Electricity.

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Charge carriers

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Questions
  1. Question
    In most substances the carriers of current are
    Choices
    1. protons
    2. electrons
    3. neutrons
    Correct choice
    electrons
  2. Question
    In electrolytic liquids the carriers are
    Choices
    1. electrons only
    2. neutrons
    3. positive and negative ions
    Correct choice
    positive and negative ions
  3. Question
    Current is defined as
    Choices
    1. net charge passing per unit time through an area
    2. charge per unit volume
    3. force per unit charge
    Correct choice
    net charge passing per unit time through an area
  4. Question
    For electrons the charge q equals
    Choices
    1. +e
    2. −e
    3. 0
    Correct choice
    −e
Electrons carry the current in most substances, but not all. Source: syllabus Physics Part I, Ch 3 Current Electricity.

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